Mark Hatmaker is the bestselling author of the No Holds Barred Fighting Series, the MMA Mastery Series, No Second Chance and Boxing Mastery. He also has produced more than 40 instructional videos. His resume includes extensive experience in the combat arts including boxing, wrestling, Jiu-jitsu and Muay Thai. He is a highly regarded coach of professional and amateur fighters, law enforcement officials and security personnel. Hatmaker founded Extreme Self Protection (ESP), a research body that compiles, analyzes and teaches the most effective Western combat methods known. He lives in Knoxville, Tennessee.